Bring a big pot of water to a boil; cook spaghetti, stirring occasionally, until al dente, 9-11 minutes or according to package directions; drain.,Meanwhile, heat oil in a large nonstick skillet over med-high heat.,Add in garlic; cook/stir until fragrant, about 1 minute.,Add in anchovies and crushed red pepper flakes; cook for 30 seconds more.,Add in tomatoes; decrease heat to medium and cook/stir for 8 minutes.,Stir in tuna and cook until it is incorporated into sauce and heated through, 2 minutes.,______,Serve hot.